| Device | Energy efficiency % | Exergy efficiency % |
| Generation | ||
| Coal fired power plant | 40 ÷ 64 | 38 ÷ 62 |
| Nuclear power plant | 30 | 28 |
| Hydro power plant | 90 | 90 |
| Wind turbine | 0.475 ÷ 0.576 | 0.475 ÷ 0.576 |
| PV system | 6 ÷ 25 | 6 ÷ 25 |
| Solar thermal | 10 ÷ 30 | 8 ÷ 25 |
| Co – trigeneration system | ||
| Cogeneration | 74 | 31 |
| Trigeneration | 94 | 28 |
| Resistance space heater | ~ 100 | 6 |
| Hot water heater | 90 | 10 |
| Heat pump –COP 3,8 | 380 | 19 |